I got a alarm that doesnt have a horn output. I wanted to make one with a relay, and the siern output on the alarm. I have a civic so the horn is going to Be A - output and the siern is a +. Any Ideas??

TIA

 

Easy!


Term # 85 of your relay to Ground
Term # 87 of your relay to Ground
Term # 86 of your relay to The alarms' (+) Siren Output
Term # 30 of your relay to The Horn

 

I already did that and it didnt work. The alarm over loads for some reason. I think the relay's 86 connection gives off a negative output when it does not have a postive input. Any more help?

 

put a diode facing the relay on the + horn output.


on my clifford ag4 I didnt even need a relay, just wired it straight into the horn and thats it.

 

What Type of diode?

 

1 amp diode...
you want the band facing away from the alarm.

get it at radio shack

 

don't do the diode. if your alarm's output doesn't match, you could blow the brain.

wire the siren output into pin 85 on the relay. tag 86 into a ground. take 30 and connect it to ground, and tag 87 to your horn wire. This way it grounds the horn wire whenever the alarm's siren output turns to 12v's.

85-- to siren out on alarm
86-- to ground
30-- to ground
87-- to horn wire

 

WHAT?

By not using the diode, you have a very high chance of getting feed back when the relay closes. This feedback is a surge large enough to damage the alarms circutry.


ultimatehonda:

Read this link.

http://www.the12volt.com/relays/relays.asp

Learn from it.

The hook up relay accordingly
85 - Alarm output
86 - Ground
87 - +12 Volts
30 - To Horn
87a - Not used

Use a 1-Amp diode coming off of the Alarm output with the band side of the diode facing the relay.